Coal gasification black water vacuum flash steam low-temperature waste heat energy recovery device

The utility model belongs to a coal gasification black water vacuum flash steam low-temperature waste heat energy recovery device. The device comprises a low-pressure flash evaporator, a gas phase outlet in the top of the low-pressure flash evaporator is connected with a low-pressure condenser, and a liquid phase outlet in the bottom of the low-pressure flash evaporator is connected with a vacuumflash evaporator; a liquid phase outlet of the vacuum flash evaporator is connected with the clarifying tank, a gas phase outlet of the vacuum flash evaporator is connected with an inlet of a vacuum flash separator sequentially through a first pressure transmitter, a first temperature transmitter, a first tee joint, a flow regulating valve, a shell pass of the evaporator, a first valve and a second tee joint, and an outlet of the vacuum flash separator is connected with a subsequent working section through a vacuum pump; a second regulating valve and a vacuum flash evaporation condenser are arranged between the third